Magnet powder, bond magnet and motor

Abstract

A magnet powder having a composition composed of R (R consists of R1 and R2, R1 represents at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb and Lu, R2 represents at least one rare earth element selected from the group consisting of Ho and Gd). T (T represents at least one transition metal element containing Fe or the combination of Fe and Co as essential element(s)) and B, wherein, the atomic ratio of R2/(R1×R2) is 0.05 to 0.1, the ratio of R/T is 0.25 to 0.35, and the magnet powder has an average primary particle size of 45 to 100 nm. The present invention also provides a bond magnet using the magnet powder.

What is claimed is: 
     
       1. A magnet powder consisting of R, T and B, wherein,
 R consists of R1 and R2, 
 R1 represents at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Er, Tm, Yb and Lu, 
 R2 represents at least one rare earth element selected from the group consisting of Ho and Gd, 
 T represents at least one transition metal element containing Fe or a combination of Fe and Co, 
 the atomic ratio of R2 to the sum of R1 and R2 is 0.05 to 0.1, 
 the atomic ratio of R to T is 0.25 to 0.35, and 
 the powder has an average primary particle size of 4 to 100 nm. 
 
     
     
       2. A bond magnet in which the magnet powder of  claim 1  is used. 
     
     
       3. A motor in which the magnet of  claim 2  is used.